Added header file that decodes the intel x86 flags register.

Added field in kinfo that can count re-lock()ing, controlled by
ENABLE_K_LOCKCHECK in config.h.

include/ibm/cpu.h

@@ -0,0 +1,16 @@
+
+#ifndef _IBM_CPU_H
+#define _IBM_CPU_H 1
+
+#define X86_FLAG_C	(1L << 0)	/* Carry */
+#define X86_FLAG_P	(1L << 2)	/* Parity */
+#define X86_FLAG_A	(1L << 4)	/* Aux. carry */
+#define X86_FLAG_Z	(1L << 6)	/* Zero */
+#define X86_FLAG_S	(1L << 7)	/* Sign */
+
+#define X86_FLAG_T	(1L <<  8)	/* Trap */
+#define X86_FLAG_I	(1L <<  9)	/* Interrupt */
+#define X86_FLAG_D	(1L << 10)	/* Direction */
+#define X86_FLAG_O	(1L << 11)	/* Overflow */
+
+#endif